\begin{tabular}{llll}
\toprule
{} &  $\sigma$ &    $\phi$ & $\alpha_0$ \\
\midrule
estimate &  2.118077 &   0.29857 &   0.163352 \\
se       &  0.003116 &  0.009669 &   0.019682 \\
\bottomrule
\end{tabular}
